United States Department of Transportation
i
Evaluation of the Effect of Moisture Conditioning on Blackbase Mixtures
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1982-03-01
[PDF-1.04 MB]
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Edition:Interim Report
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Abstract:This report describes a preliminary study which was undertaken to evaluate the effects of moisture on the engineering properties of asphalt mixtures. The static indirect tensile test was used to measure the tensile strength and modulus of elasticity of dry and moisture conditioned specimens of asphalt mixtures using the procedures recommended in NCHRP Report No. 192 and the Texas State Department of Highways and Public Transportation standard mix design procedures. Two aggregates, a rounded gravel and a crushed caliche, each with various soil binder contents, were mixed using a range of asphalt contents to produce test specimens. The engineering properties were determined and comparisons made between values for the dry and moisture conditioned specimens. Results of these comparisons indicated that the severity of the damage caused by the conditioning increased as the air void content increased and as the amount of water absorbed increased. Also, more damage was observed for the caliche mixtures than for the gravel mixtures and, generally. for both aggregate mixtures at lower asphalt contents.
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